| The BITE 2 and BITE 2P Battery Impedance Test
Equipment determine the condition of lead-acid and
nickel-cadmium cells up to 7000 Ah. An advanced feature
set has been developed that includes Pass/Warning/Fail
calculations based on a user-entered baseline value,
advanced printing functions and more. The case of the BITE
2P consists of both the transmitter and a carrying case for all
of the standard accessories and some of the optional
accessories, in an all-in-one unit. The BITE 2 and its
accessories fit into a sturdy canvas case with a shoulder strap.
The instruments work by applying a test current across the
battery string while on-line, then measuring the total
current (ac ripple + test current) and the voltage drop of
each cell/jar. It then calculates the impedance. They also
measure dc voltage and interconnection (strap) resistance
to help determine the overall condition of the entire
battery string’s electrical path from terminal plate to
terminal plate.
The BITE 2 and BITE 2P receiver stores the readings in its
internal memory. These measurements, along with other
maintenance data such as ambient and pilot cell
temperatures and ac ripple current, assist in determining
the overall condition of battery systems. Megger
recommends that impedance measurements with the
BITE 2 or BITE 2P be made part of a battery maintenance
program with readings taken and recorded semiannually
for flooded batteries and quarterly for VRLA.
Unlike load cycle testing that involves substantial
downtime and repeated discharges, using the instruments
require no battery discharge, nor do they stress the battery
in any way compared to other techniques. With a test time
of less than 20 seconds for each cell and intercell
connector, one person can easily, quickly, and precisely
measure internal cell impedance, dc terminal voltage and
intercell connection resistance without taking the battery
system off line.
Naturally, everything you need to perform these tests is
included with the basic instruments. There is a full line of
optional accessories to enhance the capabilities of the
BITE 2 and BITE 2P. Both have the ability to download to
a PC for data interpretation. Additionally, the BITE 2P has
a built-in printer to review the active test but also to leave
a hard copy record at the site. | 
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